Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Finite-lived Intangible Assets [Roll Forward]
Gross Carrying Value	$ 2,344,982	$ 2,371,392
Accumulated Amortization	1,621,904	1,471,064
Total finite-lived intangible assets	723,078	900,328
Indefinite-lived Intangible Assets [Roll Forward]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	1,480,000	1,480,000
Indefinite-Lived Trade Names	609,500	651,500
Intangible Assets, Gross (Excluding Goodwill)	3,824,982	3,851,392
Other Intangible Assets Accumulated Amortization	1,621,904	1,471,064
Indefinite Lived Trade Names Impairment Charges	870,500	828,500
Intangible Assets Impairement Charges	870,500	828,500
Intangible Assets, Net (Including Goodwill)	$ 1,332,578	$ 1,551,828
Client relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Weighted Average Useful Life	14 years	14 years
Gross Carrying Value	$ 2,256,382	$ 2,282,792
Accumulated Amortization	1,559,551	1,417,570
Total finite-lived intangible assets	$ 696,831	$ 865,222
Trade names [Member]
Finite-lived Intangible Assets [Roll Forward]
Weighted Average Useful Life	10 years	10 years
Gross Carrying Value	$ 88,600	$ 88,600
Accumulated Amortization	62,353	53,494
Total finite-lived intangible assets	$ 26,247	$ 35,106